Hygroscopic properties: some substances can draw water from the air, miasalnya: FeCl3, KOH, NaOH, CaCl2, MgCl2 and others.

The nature of acidity and alkalinity: sometimes the nature of acidity and alkalinity are able to support the analysis. Examination conducted by a solution of the substance in the water and checked with litmus blue litmus red.

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a good life is like a *candle*... he never complained and sad ... that he knows ... he shared fire of life to illuminate the surroundings. and at once gave offerings his life to the Lord.
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